铝/铜高频感应接触反应钎焊

Reactive contact brazing between aluminium alloy and copper by high frequency induction method

摘要: 对铝/铜异种金属接头的高频感应接触反应钎焊工艺进行了研究,在非真空条件下借助钎剂的去膜作用,实现了铝和铜的连接,并根据钎剂去膜过程和对接头力学性能的影响规律优化了钎剂组分.同时借助扫描电镜和能谱分析等分析手段,详细分析了接头的界面结构与物相组成.结果表明,试验中配制的钎剂65%ZnCl₂+10%NaCl+25%NH₄Cl钎焊效果较好,钎缝厚度约为80μm,钎缝主要由铝基固溶体和化合物Al₂Cu弥散相组成,有大量的Zn元素和Na元素扩散进入钎缝,接头抗剪强度可以达到58 MPa.

Abstract: High-frequency induction contact reactive brazing of 6063 aluminium alloy to pure copper was investigated in this paper.The composition of the brazing flux was optimized according to the brazing process and mechanical properties of the resultant joints.The interfacial microstructure and phase constitution of the joint was analyzed by means of SEM and EDS.The results showed that the joint made with the flux of 65% ZnCl₂+10% NaCl+25% NH₄Cl was better than the joints made with the other two fluxes.The thickness of the brazing seam was about 80 μm and the interface mainly consisted of Al solid solution and Al₂Cu phases,and massive Zn and Na elements diffused into the seam.The maximum shearing strength of the joint reached 58 MPa.